Adding new module name ila. This implements ILA translation. Light
weight tunnel redirection is used to perform the translation in
the data path. This is configured by the ip -6 route command
using the encap ila locator option, where locator is the
value to set in destination locator of the packet. e.g.
ip -6 route add :0:0:1::0:1:0/128 \
encap ila 2001:0:0:1 via 2401:db00:20:911a:face:0:25:0
Sets a route where :0:0:1 will be overwritten by
2001:0:0:1 on output.
Signed-off-by: Tom Herbert t...@herbertland.com
---
include/uapi/linux/ila.h | 15 +++
include/uapi/linux/lwtunnel.h | 1 +
net/ipv6/Kconfig | 19
net/ipv6/Makefile | 1 +
net/ipv6/ila.c| 216 ++
5 files changed, 252 insertions(+)
create mode 100644 include/uapi/linux/ila.h
create mode 100644 net/ipv6/ila.c
diff --git a/include/uapi/linux/ila.h b/include/uapi/linux/ila.h
new file mode 100644
index 000..7ed9e67
--- /dev/null
+++ b/include/uapi/linux/ila.h
@@ -0,0 +1,15 @@
+/* ila.h - ILA Interface */
+
+#ifndef _UAPI_LINUX_ILA_H
+#define _UAPI_LINUX_ILA_H
+
+enum {
+ ILA_ATTR_UNSPEC,
+ ILA_ATTR_LOCATOR, /* u64 */
+
+ __ILA_ATTR_MAX,
+};
+
+#define ILA_ATTR_MAX (__ILA_ATTR_MAX - 1)
+
+#endif /* _UAPI_LINUX_ILA_H */
diff --git a/include/uapi/linux/lwtunnel.h b/include/uapi/linux/lwtunnel.h
index 31377bb..04bac3b 100644
--- a/include/uapi/linux/lwtunnel.h
+++ b/include/uapi/linux/lwtunnel.h
@@ -7,6 +7,7 @@ enum lwtunnel_encap_types {
LWTUNNEL_ENCAP_NONE,
LWTUNNEL_ENCAP_MPLS,
LWTUNNEL_ENCAP_IP,
+ LWTUNNEL_ENCAP_ILA,
__LWTUNNEL_ENCAP_MAX,
};
diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig
index 643f613..983bb99 100644
--- a/net/ipv6/Kconfig
+++ b/net/ipv6/Kconfig
@@ -92,6 +92,25 @@ config IPV6_MIP6
If unsure, say N.
+config IPV6_ILA
+ tristate IPv6: Identifier Locator Addressing (ILA)
+ select LWTUNNEL
+ ---help---
+ Support for IPv6 Identifier Locator Addressing (ILA).
+
+ ILA is a mechanism to do network virtualization without
+ encapsulation. The basic concept of ILA is that we split an
+ IPv6 address into a 64 bit locator and 64 bit identifier. The
+ identifier is the identity of an entity in communication
+ (who) and the locator expresses the location of the
+ entity (where).
+
+ ILA can be configured using the encap ila option with
+ ip -6 route command. ILA is described in
+ https://tools.ietf.org/html/draft-herbert-nvo3-ila-00.
+
+ If unsure, say N.
+
config INET6_XFRM_TUNNEL
tristate
select INET6_TUNNEL
diff --git a/net/ipv6/Makefile b/net/ipv6/Makefile
index 0f3f199..2c900c7 100644
--- a/net/ipv6/Makefile
+++ b/net/ipv6/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_INET6_XFRM_MODE_TUNNEL) += xfrm6_mode_tunnel.o
obj-$(CONFIG_INET6_XFRM_MODE_ROUTEOPTIMIZATION) += xfrm6_mode_ro.o
obj-$(CONFIG_INET6_XFRM_MODE_BEET) += xfrm6_mode_beet.o
obj-$(CONFIG_IPV6_MIP6) += mip6.o
+obj-$(CONFIG_IPV6_ILA) += ila.o
obj-$(CONFIG_NETFILTER)+= netfilter/
obj-$(CONFIG_IPV6_VTI) += ip6_vti.o
diff --git a/net/ipv6/ila.c b/net/ipv6/ila.c
new file mode 100644
index 000..fd9498d
--- /dev/null
+++ b/net/ipv6/ila.c
@@ -0,0 +1,216 @@
+#include linux/errno.h
+#include linux/ip.h
+#include linux/kernel.h
+#include linux/module.h
+#include linux/skbuff.h
+#include linux/socket.h
+#include linux/types.h
+#include net/checksum.h
+#include net/ip.h
+#include net/ip6_fib.h
+#include net/lwtunnel.h
+#include net/protocol.h
+#include uapi/linux/ila.h
+
+struct ila_params {
+ __be64 locator;
+};
+
+static inline struct ila_params *ila_params_lwtunnel(
+ struct lwtunnel_state *lwstate)
+{
+ return (struct ila_params *)lwstate-data;
+}
+
+static inline __wsum compute_csum_diff8(const __be32 *from, const __be32 *to)
+{
+ __be32 diff[] = {
+ ~from[0], ~from[1], to[0], to[1],
+ };
+
+ return csum_partial(diff, sizeof(diff), 0);
+}
+
+static inline __wsum get_csum_diff(struct ipv6hdr *ip6h, struct ila_params *p)
+{
+ return compute_csum_diff8((__be32 *)ip6h-daddr,
+ (__be32 *)p-locator);
+}
+
+static void update_ipv6_locator(struct sk_buff *skb, struct ila_params *p)
+{
+ __wsum diff;
+ struct ipv6hdr *ip6h = ipv6_hdr(skb);
+ size_t nhoff = sizeof(struct ipv6hdr);
+
+ /* First update checksum */
+ switch (ip6h-nexthdr) {
+ case NEXTHDR_TCP:
+ if (likely(pskb_may_pull(skb, nhoff + sizeof(struct tcphdr {
+ struct tcphdr *th = (struct tcphdr *)
+ (skb_network_header(skb) + nhoff);
+
+ diff = get_csum_diff(ip6h, p);
+ inet_proto_csum_replace_by_diff(th-check, skb,
+
